The mass of a normal helium nucleus is times the mass of a normal hydrogen nucleus.

The answer is slightly less than 4 times. One helium nucleus has less mass than 4 hydrogen nuclei by about 0.1%, and E = mc2. Einstein showed that mass and energy are equivalent (c = speed of light) that mass can be converted to energy, and energy can be converted to mass. The Sun is powered by the conversion of mass into energy and so are nuclear reactors and nuclear bombs.

The chemical bubbles

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.